Journal
JOURNAL OF MICROBIOLOGY
Volume 56, Issue 10, Pages 753-759Publisher
MICROBIOLOGICAL SOCIETY KOREA
DOI: 10.1007/s12275-018-8120-5
Keywords
growth promotion; Streptomyces; salt-stress; tomato
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2017R1D1A3B03027816]
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A novel actinobacterium, strain SK68, was isolated from the rhizosphere of peanut plant and its salinity stress alleviation ability was studied using tomato (Solanum lycopersicum cv. Micro-Tom) plants. Based on 16S rDNA based phylogenetic analysis, strain SK68 has been identified as a Streptomyces sp. Strain SK68 had branched substrate mycelium bearing smooth surfaced spores and the spore colour is brownish grey on ISP4 medium. It exhibited enzyme activities such as xylanase, cellulase, amylase, and pectinase and degraded hypoxanthine, casein, and L-tyrosine. The strain SK68 differed in its banding pattern in BOX-PCR and RAPD fingerprinting compared to the closely matching type strains Streptomyces erythrochromogenes NBRC 3304(T) (AB184746), S. flavotricini NBRC 12770(T) (AB184132), S. racemochromogenes NBRC 12906(T) (AB184235), and S. polychromogenes NBRC 13072(T) (NR041109). Strain SK68 was evaluated for its salinity stress-alleviating activity in tomato plants with 180 mmol/L NaCl under gnotobiotic condition. A significant increase in plant biomass was observed in strain SK68-inoculated tomato plants under salt stress compared to control and salt-stressed non-inoculated plants.
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